Flexible circuit board and manufacturing method, display device, circuit board structure and display panel thereof

Abstract

This disclosure provides a flexible circuit board and a manufacturing method therefor, and a display device. The flexible circuit board includes a main body sub-circuit board and a bridge sub-circuit board; The main body sub-circuit board includes a first substrate, as well as a first bridge connection end, a second bridge connection end, a first wiring portion, and a second wiring portion disposed on the first substrate The bridge sub-circuit board includes a second substrate, as well as a third bridge connection end, a fourth bridge connection end, and a third wiring portion used for a first functional wiring, all disposed on the second substrate.

What is claimed is: 
     
       1. A display device comprising a display panel and a flexible circuit board, wherein
 the display panel is provided with pixel units arranged in an array, a touch driving wiring and a touch sensing wiring; 
 the display panel further comprises a second functional circuit structure that is a display circuit structure and electrically connected to the pixel units; 
 second contact pads for electrically connecting to the flexible circuit board are also provided at a side of the display panel; 
 some of the second contact pads are electrically connected to the second functional circuit, some other of the second contact pads are electrically connected to the touch driving wiring, and some further of the second contact pads are electrically connected to the touch sensing wiring; 
 the some of the second contact pads electrically connected to the second functional circuit structure are between the some other of the second contact pads electrically connected to the touch driving wiring and the some further of the second contact pads electrically connected to the touch sensing wiring; 
 the flexible circuit board comprises a main body sub-circuit board and a bridge sub-circuit board, wherein 
 the main body sub-circuit board comprises a first substrate, and a first bridge connection end, a second bridge connection end, a first wiring portion and a second wiring portion on the first substrate, in which the first wiring portion and the second wiring portion are separated from each other, the first wiring portion is electrically connected to the first bridge connection end, and the second wiring portion is electrically connected to the second bridge connection end; 
 the flexible circuit board further comprises a first functional wiring comprising the first wiring portion, the second wiring portion and a third wiring portion; 
 the bridge sub-circuit board comprises a second substrate, and a third bridge connection end, a fourth bridge connection end and the third wiring portion for the first functional wiring on the second substrate, in which the third bridge connection end and the fourth bridge connection end are electrically connected by the third wiring portion; 
 the bridge sub-circuit board is configured to be installed on the main body sub-circuit board by respectively electrically connecting the third bridge connection end and the fourth bridge connection end to the first bridge connection end and the second bridge connection end; 
 a terminal for electrically connecting to the display panel is also provided at a side of the main body sub-circuit board, and has a plurality of first contact pads; 
 the main body sub-circuit board further comprises a second functional wiring and a third functional wiring, in which the third functional wiring is between the first wiring portion and the second wiring portion, an orthographic projection of the third functional wiring on the first substrate at least partially overlaps with an orthographic projection of the bridge sub-circuit board on the first substrate; 
 the first functional wiring of the main body sub-circuit board is electrically connected to the touch driving wiring of the display panel, and the second functional wiring of the main body sub-circuit board is electrically connected to the touch sensing wiring of the display panel; or 
 the first functional wiring of the main body sub-circuit board is electrically connected to the touch sensing wiring of the display panel, and the second functional wiring of the main body sub-circuit board is electrically connected to the touch driving wiring of the display panel; 
 the third functional wiring of the main body sub-circuit board is electrically connected to the second functional circuit structure of the display panel; 
 the flexible circuit board further comprises a first control circuit combination structure electrically connected to the first functional wiring; 
 the first control circuit combination structure is also electrically connected to the second functional wiring; 
 the touch driving wiring of the display panel is electrically connected to the first control circuit combination structure of the flexible circuit board through the first functional wiring, and the touch sensing wiring of the display panel is electrically connected to the first control circuit combination structure through the second functional wiring of the flexible circuit board; or 
 the touch sensing wiring of the display panel is electrically connected to the first control circuit combination structure of the flexible circuit board through the first functional wiring, and the touch driving wiring of the display panel is electrically connected to the first control circuit combination structure through the second functional wiring of the flexible circuit board; 
 the second contact pads of the display panel are electrically connected to the first contact pads of the flexible circuit board. 
 
     
     
       2. The display device of  claim 1 , wherein the first control circuit combination structure is configured to provide a first electrical signal to the first functional wiring or receive a first electrical signal from the first functional wiring, and is further configured to provide a second electrical signal to the second functional wiring or receive a second electrical signal from the second functional wiring. 
     
     
       3. The display device of  claim 2 , wherein the first control circuit combination structure is configured to be bonded with a first control circuit that comprises a touch driving IC chip. 
     
     
       4. The display device of  claim 1 , wherein the touch sensing wiring at least comprises a part at a side of the display panel opposite to the second contact pads, and the touch driving wiring at least comprises a part at any side except a side of the display panel with the second contact pads and the side thereof opposite to the second contact pads. 
     
     
       5. The display device of  claim 1 , wherein the first functional wiring electrically connected to the touch driving wiring is bridged by the bridge sub-circuit board, and a distance between the touch driving wiring and the first control circuit combination structure is greater than a distance between the touch sensing wiring and the first control circuit combination structure, or
 the first functional wiring electrically connected to the touch sensing wiring is bridged by the bridge sub-circuit board, a distance between the touch sensing wiring and the first control circuit combination structure is greater than the distance between the touch driving wiring and the first control circuit combination structure. 
 
     
     
       6. The display device of  claim 1 , wherein the first control circuit combination structure is disposed on the main body sub-circuit board and electrically connected to the first wiring portion, or the first control circuit combination structure is disposed on the bridge sub-circuit board and electrically connected to the third wiring portion;
 the first control circuit combination structure is configured to provide a first electrical signal to the first functional wiring or receive a first electrical signal from the first functional wiring. 
 
     
     
       7. The display device of  claim 2 , wherein the main body sub-circuit board comprises a first main body wiring layer at a first side of the first substrate and a first main body insulating layer laminated on a side of the first main body wiring layer far away from the first substrate;
 the first side is a side of the main body sub-circuit board close to the bridge sub-circuit board; 
 the main body sub-circuit board further comprises a second main body wiring layer at a second side of the first substrate and a second main body insulating layer laminated on a side of the second main body wiring layer far away from the first substrate; 
 a part of the first wiring portion is in the first main body wiring layer, and another part of the first wiring portion is in the second main body wiring layer; 
 a part of the second wiring portion is in the first main body wiring layer, and another part of the second wiring portion is in the second main body wiring layer; and/or 
 the bridge sub-circuit board comprises a first bridge wiring layer at a first side of the second substrate and a first bridge insulating layer laminated on a side of the first bridge wiring layer far away from the second substrate, the first bridge wiring layer comprises the third wiring portion. 
 
     
     
       8. The display device of  claim 7 , wherein a part of the second functional wiring is in the first main body wiring layer, and another part of the second functional wiring is in the second main body wiring layer; or
 the second functional wiring is all in the first main body wiring layer; 
 a part of the third functional wiring is in the first main body wiring layer, and another part of the third functional wiring is in the second main body wiring layer; or 
 the third functional wiring is all in the second main body wiring layer. 
 
     
     
       9. The display device of  claim 7 , wherein the second functional wiring is all in the first main body wiring layer, and the third functional wiring is all in the second main body wiring layer; and/or wherein the first main body insulating layer has a first via hole exposing the first bridge connection end and the second bridge connection end. 
     
     
       10. The display device of  claim 7 , wherein at least a part of a wiring of the first wiring portion on the second main body wiring layer is electrically connected to the first main body wiring layer through a second via hole, for electrically connecting to the bridge sub-circuit board through the first bridge connection end; and at least a part of a wiring of the second wiring portion on the second main body wiring layer is electrically connected to the first main body wiring layer through the second via hole, for electrically connecting to the bridge sub-circuit board through the second bridge connection end. 
     
     
       11. The display device of  claim 7 , wherein the bridge sub-circuit board further comprises a ground layer at a second side of the second substrate opposite to the first side thereof,
 when the bridge sub-circuit board is installed on the main body sub-circuit board, the second side is closer to the main body sub-circuit board than the first side. 
 
     
     
       12. The display device of  claim 11 , wherein the bridge sub-circuit board further comprises a second bridge insulating layer laminated on a side of the ground layer far away from the second substrate; and the second bridge insulating layer has a plurality of openings exposing a part of the ground layer, and the plurality of openings serve as the third bridge connection end and/or the fourth bridge connection end, for electrically connecting the bridge sub-circuit board to the main body sub-circuit board; and/or wherein the bridge sub-circuit board further comprises a shielding layer at the second side of the second substrate, and the shielding layer is laminated on a side of the ground layer far away from the second electrode plate. 
     
     
       13. The display device of  claim 1 , wherein the third bridge connection end and the fourth bridge connection end of the bridge sub-circuit board are respectively connected to the first bridge connection end and the second bridge connection end of the main body sub-circuit board through anisotropic conductive adhesives, soldering materials or connectors. 
     
     
       14. The display device of  claim 13 , wherein surfaces of the first bridge connection end and the second bridge connection end comprise tin materials, and the third bridge connection end and the fourth bridge connection end of the bridge sub-circuit board are respectively welded to the first bridge connection end and the second bridge connection end of the main body sub-circuit board by the tin materials such that the bridge sub-circuit board is electrically connected to the main body sub-circuit board. 
     
     
       15. The display device of  claim 7 , wherein the main body sub-circuit board further comprises a terminal with a plurality of first contact pads thereon;
 an end of each of a plurality of wirings of the second wiring portion is electrically connected to each of some of the first contact pads in the terminal in one-to-one correspondence; 
 an end of each of a plurality of wirings of the second functional wiring is electrically connected to each of some other of the first contact pads in the terminal in one-to-one correspondence; 
 an end of each of a plurality of wirings of the third functional wiring is electrically connected to each of some further of the first contact pads in the terminal in one-to-one correspondence; 
 some of the first contact pads respectively electrically connected to the second wiring portion, the third functional wiring and the second functional wiring are spaced apart in the terminal. 
 
     
     
       16. A display device comprising a display panel and a flexible circuit board, wherein
 the display panel is provided with pixel units arranged in an array, a touch driving wiring and a touch sensing wiring; 
 the display panel further comprises a second functional circuit structure that is a display circuit structure and electrically connected to the pixel units; 
 second contact pads for electrically connecting to the flexible circuit board are also provided at a side of the display panel; 
 some of the second contact pads are electrically connected to the second functional circuit, some other of the second contact pads are electrically connected to the touch driving wiring, and some further of the second contact pads are electrically connected to the touch sensing wiring; 
 the some of the second contact pads electrically connected to the second functional circuit structure are between the some other of the second contact pads electrically connected to the touch driving wiring and the some further of the second contact pads electrically connected to the touch sensing wiring; 
 the flexible circuit board comprises a main body sub-circuit board and a bridge sub-circuit board, wherein 
 the main body sub-circuit board comprises a first substrate, and a first bridge connection end, a second bridge connection end, a first wiring portion and a second wiring portion on the first substrate, the first wiring portion and the second wiring portion are separated from each other and respectively electrically connected to the first bridge connection end and the second bridge connection end; 
 the bridge sub-circuit board comprises a second substrate, and a third bridge connection end, a fourth bridge connection end and a third wiring portion for a first functional wiring on the second substrate, in which the third bridge connection end and the fourth bridge connection end are electrically connected by the third wiring portion; 
 the bridge sub-circuit board is configured to be installed on the main body sub-circuit board by respectively electrically connecting the third bridge connection end and the fourth bridge connection end to the first bridge connection end and the second bridge connection end, so that the first wiring portion, the third wiring portion and the second wiring portion are sequentially electrically connected to obtain the first functional wiring; 
 the main body sub-circuit board comprises a first main body wiring layer at a first side of the first substrate and a first main body insulating layer laminated on a side of the first main body wiring layer far away from the first substrate, and the first side is a side of the main body sub-circuit board close to the bridge sub-circuit board; the main body sub-circuit board further comprises a second main body wiring layer at a second side of the first substrate and a second main body insulating layer laminated on a side of the second main body wiring layer far away from the first substrate; a part of the first wiring portion is in the first main body wiring layer, and another part of the first wiring portion is in the second main body wiring layer; a part of the second wiring portion is in the first main body wiring layer, and another part is in the second main body wiring layer; the second functional wiring is all in the first main body wiring layer, and the third functional wiring is all in the second main body wiring layer; the first main body insulating layer has a first via hole exposing the first bridge connection end and the second bridge connection end; at least a part of a wiring of the first wiring portion on the second main body wiring layer is electrically connected to the first main body wiring layer through a second via hole, for electrically connecting to the bridge sub-circuit board through the first bridge connection end; and at least a part of a wiring of the second wiring portion on the second main body wiring layer is electrically connected to the first main body wiring layer through the second via hole, for electrically connecting to the bridge sub-circuit board through the second bridge connection end; the first main body wiring layer comprises the first wiring portion, the second wiring portion, the first bridge connection end and the second bridge connection end; the first bridge connection end and the second bridge connection end are exposed by the first main body insulating layer; the main body sub-circuit board further comprises a second main body wiring layer at a second side of the first substrate opposite to the first side thereof, and a second main body insulating layer laminated on a side of the second main body wiring layer far away from the first substrate; the second main body wiring layer comprises the first wiring portion and the second wiring portion; 
 the bridge sub-circuit board comprises a first bridge wiring layer at a first side of the second substrate and a first bridge insulating layer laminated on a side of the first bridge wiring layer far away from the second substrate, and the first bridge wiring layer comprises the third wiring portion; the bridge sub-circuit board further comprises a ground layer at a second side of the second substrate opposite to the first side thereof; when the bridge sub-circuit board is installed on the main body sub-circuit board, the second side is closer to the main body sub-circuit board than the first side; the bridge sub-circuit board further comprises a second bridge insulating layer laminated on a side of the ground layer far away from the second substrate; the second bridge insulating layer is provided with a plurality of openings exposing part of the ground layer, and the plurality of openings serve as the third bridge connection end and/or the fourth bridge connection end, for electrically connecting the bridge sub-circuit board to the main body sub-circuit board; 
 a terminal for electrically connecting to the display panel is also provided at a side of the main body sub-circuit board, and has a plurality of first contact pads; 
 the main body sub-circuit board further comprises a second functional wiring and a third functional wiring, the third functional wiring is between the first wiring portion and the second wiring portion, an orthographic projection of the third functional wiring on the first substrate at least partially overlaps with an orthographic projection of the bridge sub-circuit board on the first substrate; 
 the first functional wiring of the main body sub-circuit board is electrically connected to the touch driving wiring of the display panel, and the second functional wiring of the main body sub-circuit board is electrically connected to the touch sensing wiring of the display panel; 
 the third functional wiring of the main body sub-circuit board is electrically connected to a second functional circuit structure of the display panel; 
 the flexible circuit board further comprises a first control circuit combination structure electrically connected to the first functional wiring; 
 the first control circuit combination structure is also electrically connected to the second functional wiring; 
 the touch driving wiring of the display panel is electrically connected to the first control circuit combination structure of the flexible circuit board through the first functional wiring, and the touch sensing wiring of the display panel is electrically connected to the first control circuit combination structure through the second functional wiring of the flexible circuit board; and 
 the second contact pads of the display panel are electrically connected to the first contact pads of the flexible circuit board.